from hyperchem prog.

Look for page 603 of the Orca manual 4.2.1. Use the following command in the input file:

%geom

MaxIter 50 #50 is the default number, use more if necessary

end

I would suggest also using Orca input library as handy tools for selecting paraments in .inp file:

https://sites.google.com/site/orcainputlibrary/